Buggy code:
public class ZipFile { private static final int HASH_SIZE = 509 ; private static final int SHORT = 2 ; private static final int WORD = 4 ; private static final int NIBLET_MASK = 15 ; private static final int BYTE_SHIFT = 8 ; private static final int POS_0 = 0 ; private static final int POS_1 = 1 ; private static final int POS_2 = 2 ; private static final int POS_3 = 3 ; private final Map entries = new HashMap ( ZipFile . HASH_SIZE ) ; private final Map nameMap = new HashMap ( ZipFile . HASH_SIZE ) ; private static final class OffsetEntry { private long headerOffset = - 1 ; private long dataOffset = - 1 ; } private final String encoding ; private RandomAccessFile archive ; public ZipFile ( File f ) throws IOException { } public ZipFile ( String name ) throws IOException { } public ZipFile ( String name , String encoding ) throws IOException { } public ZipFile ( File f , String encoding ) throws IOException { } public String getEncoding ( ) { } public void close ( ) throws IOException { } public static void closeQuietly ( ZipFile zipfile ) { } public Enumeration getEntries ( ) { } public ZipArchiveEntry getEntry ( String name ) { } public InputStream getInputStream ( ZipArchiveEntry ze ) throws IOException , ZipException { } private static final int CFH_LEN = ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ZipFile . SHORT ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . WORD ) ) + ( ZipFile . WORD ) ) + ( ZipFile . WORD ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . WORD ) ) + ( ZipFile . WORD ) ; private void populateFromCentralDirectory ( ) throws IOException { } private static final int MIN_EOCD_SIZE = ( ( ( ( ( ( ( ZipFile . WORD ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . WORD ) ) + ( ZipFile . WORD ) ) + ( ZipFile . SHORT ) ; private static final int MAX_EOCD_SIZE = ( ZipFile . MIN_EOCD_SIZE ) + 65535 ; private static final int CFD_LOCATOR_OFFSET = ( ( ( ( ( ZipFile . WORD ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . WORD ) ; private void positionAtCentralDirectory ( ) throws IOException { } private static final long LFH_OFFSET_FOR_FILENAME_LENGTH = ( ( ( ( ( ( ( ( ZipFile . WORD ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . SHORT ) ) + ( ZipFile . WORD ) ) + ( ZipFile . WORD ) ) + ( ZipFile . WORD ) ; private void resolveLocalFileHeaderData ( ) throws IOException { } protected static Date fromDosTime ( ZipLong zipDosTime ) { } private static long dosToJavaTime ( long dosTime ) { } protected String getString ( byte [ ] bytes , String enc ) throws ZipException { if ( enc == null ) { return new String ( bytes ) ; } else { try { <START_BUG> return ZipEncodingHelper . decodeName ( bytes , encoding ) ; <END_BUG> } catch ( UnsupportedCharsetException ex ) { try { return new String ( bytes , enc ) ; } catch ( UnsupportedEncodingException uee ) { throw new ZipException ( uee . getMessage ( ) ) ; } } } } private boolean startsWithLocalFileHeader ( ) throws IOException { } private class BoundedInputStream extends InputStream { private long remaining ; private long loc ; private boolean addDummyByte = false ; BoundedInputStream ( long start , long remaining ) { } public int read ( ) throws IOException { } public int read ( byte [ ] b , int off , int len ) throws IOException { } void addDummy ( ) { } } }

Fix:
return ZipEncodingHelper . decodeName ( bytes , enc ) ;